This is in my garage so it doesn't have to be the most perfect solution, but I'd like to do something about this ugly gap between the cinderblock wall and concrete slab.

What would you use to fill this gap?

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  • Decent looking and easy, wood(baseboard like) or metal flashing. Ugly spray foam will do also. A bit harder would be a 2x2 or 3x3 cement curb, or fill gap up with mortar.
    – crip659
    Sep 28, 2023 at 19:31

1 Answer 1


Your desire

Any solution you choose is going to bring even more attention to that seemingly small gap unless you paint everything after.

Overall, just get some mortar mix and fill it.

Real problem

Your floor is sinking. Any vanity solution will fail in 1-5 years.

  • Just jam some appropriately-sized backer rod in there. If the gap continues to expand, replace with thicker rod in the future.
    – Huesmann
    Sep 29, 2023 at 17:57

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